Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass

Alexandrou, C.; Constantinou, M.; Dimopoulos, P.; Frezzotti, R.; Hadjiyiannakou, K.; Jansen, K.; Kallidonis, C.; Kostrzewa, B.; Koutsou, G.; Mangin-Brinet, M.; Vaquero Avilès-Casco, A.; Wenger, Urs (2017). Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass. Physical review. D - particles, fields, gravitation, and cosmology, 95(11), p. 114514. American Physical Society 10.1103/PhysRevD.95.114514

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We present results on the light, strange and charm nucleon scalar and tensor charges from lattice QCD, using simulations with Nf 1⁄4 2 flavors of twisted mass clover-improved fermions with a physical value of the pion mass. Both connected and disconnected contributions are included, enabling us to extract the isoscalar, strange and charm charges for the first time directly at the physical point. Furthermore, the renormalization is computed nonperturbatively for both isovector and isoscalar quantities. We investigate excited state effects by analyzing several sink-source time separations and by employing a set of methods to probe ground state dominance. Our final results for the scalar charges are guS = 5.20(42)(15)(12), gdS = 4.27(26)(15)(12), gsS = 0.33(7)(1)(4), and gcS = 0.062(13)(3)(5) and for the tensor charges guT = 0.794(16)(2)(13), gdT = −0.210(10)(2)(13), gsT = 0.00032(24)(0), and gcT = 0.00062(85)(0) in the MS scheme at 2 GeV. The first error is statistical, the second is the systematic error due to the renormalization and the third the systematic arising from estimating the contamination due to the excited states, when our data are precise enough to probe the first excited state.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Wenger, Urs

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

03 Nov 2017 08:39

Last Modified:

03 Nov 2017 08:39

Publisher DOI:

10.1103/PhysRevD.95.114514

ArXiv ID:

1703.08788

BORIS DOI:

10.7892/boris.102362

URI:

https://boris.unibe.ch/id/eprint/102362

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